Mechanism of Roadway Floor Heave Controlled by Floor Corner Pile in Deep Roadway under High Horizontal Stress

In order to overcome the support difficulty of serious floor heave caused by rock burst, with ventilation roadway in Hegang Xing An Coal Mine as engineering background, treatment scheme concrete-filled steel tube corner pile and grouting is put forward. Based on solution slip line field under plane strain condition, mechanical model slip-type established, formula for calculating critical failure depth minimum derived. Through numerical analysis similar tests, deformation stress distribution surrounding piles are studied, force law high horizontal analyzed. The results show that, compared anchor, + can significantly improve properties mass, plastic plate part be cut piles, which effectively controls stress; length inclination angle have a great influence effect. on-site scheme, 1.1 times calculated should selected. test that effective controlling two sides.